Exchange migration

SKB1077

How to Migrate from Exchange to Exchange?

There is often a requirement to migrate mailbox data from one Exchange server to another. Although there are manual methods to migrate mailboxes, they are time consuming and may result in data loss. On the other hand, if you use the Exchange to Exchange migration process of Stellar Migrator for Exchange, you can easily perform this process. Steps for Migrating from Exchange Server to Exchange Ser..

Date Published 21 Feb 2025

eye_icon

Total Views 2529

SKB1078

How to Migrate from Exchange to Office 365?

There is often a requirement to migrate mailbox data from Exchange server to Office 365. Although there are manual methods to migrate mailboxes, they are time consuming and may result in data loss. On the other hand, if you use the Exchange to Office 365 migration process of Stellar Migrator for Exchange, you can easily perform this process. Steps for Migrating from Exchange Server to Office 365 H..

Date Published 24 Feb 2025

eye_icon

Total Views 2754

SKB1079

How to Migrate from Office 365 to Office 365?

A situation where two organizations, using separate Microsoft 365 account, are merging for collaboration will require a consolidated Microsoft 365 account for email communication. In this case, the mailboxes from one Microsoft 365 account need to be migrated to another. Since the migration will be a cross-domain migration, the manual process will be difficult and time consuming. To avoid this, you..

Date Published 24 Feb 2025

eye_icon

Total Views 2860

SKB1086

How to Migrate from Office 365 to Exchange using Stellar Migrator for Exchange?

You can use Stellar Migrator for Exchange to Migrate mailboxes from Microsoft 365 to an on premise Exchange server. This software will directly access the mailboxes on the cloud-based server and migrate them to the source server. Steps to migrate mailboxes from Microsoft 365 to Exchange server using Stellar Migrator for Exchange Download and open Stellar Migrator for Exchange. From the Log..

Date Published 25 Apr 2025

eye_icon

Total Views 367

SKB1087

How to Migrate Public Folder from Exchange to Office 365

If you want to migrate public folders from Exchange server to the public folders Office 365 using Stellar Migrator for Exchange, you will have to create a separate job. This is necessary because the software will migrate Emails and archives together but not public folders. Steps to migrate public folders from Exchange server to Microsoft 365 using Stellar Migrator for Exchange Download and ru..

Date Published 01 May 2025

eye_icon

Total Views 437

SKB1093

How to Resolve: "There are no public folder servers available" Error During Public Folder Migration?

During a public folder migration or when attempting to access public folders in Exchange, the following error may appear: "There are no public folder servers available." This error typically occurs when no public folder mailbox exists in the environment. Public folders require at least one public folder mailbox to be present and active. Without it, Exchange cannot mount or access the publi..

Date Published 04 Jul 2025

eye_icon

Total Views 293

SKB1094

How to Resolve "The Specified Folder Could Not Be Found in the Store" Error?

When attempting to migrate archive mailboxes, you may encounter the following error: "The specified folder could not be found in the store." This error typically occurs when the archive mailbox for a user is not enabled before the migration is initiated. Migration operations expect the archive mailbox to exist, and if it does not, the folder structure referenced during the migration proces..

Date Published 04 Jul 2025

eye_icon

Total Views 341

SKB1095

How to Resolve: "The mailbox database is temporarily unavailable" Error?

While attempting to migrate a mailbox in Exchange, you may encounter the following error: "The mailbox database is temporarily unavailable." Cause This error typically occurs when the mailbox database that hosts the user's mailbox is dismounted. Migration cannot proceed if the database is not mounted and accessible. Resolution To resolve this issue, mount the dismounted mailbo..

Date Published 04 Jul 2025

eye_icon

Total Views 375

SKB1096

How to Extend Microsoft Entra ID Access Token Period?

The Microsoft access token lifetime policy is applicable on global tenant or organization. The current maximum Access Token lifetime is 24 hours. Create policy: Step1: Open Windows PowerShell as Administrator Step2: Install Microsoft Graph (if not already installed) Install-Module Microsoft.Graph -Scope Currentuser Step3: Connect to Microsoft Graph with required sc..

Date Published 15 Jul 2025

eye_icon

Total Views 508

SKB1100

How to resolve error “Exceeded Message Size Restrictions”?

When migrating mailboxes, you may encounter the error: “Exceeded message size restrictions.” This happens when the source mailbox contains emails larger than the maximum message size allowed at the destination server. If the destination mailbox has stricter size restrictions, the migration cannot proceed for those messages. Cause The maximum message size at the destination server is smaller ..

Date Published 18 Sep 2025

eye_icon

Total Views 237

SKB1101

How to resolve the Error “Insufficient privileges to complete the operation”?

Issue When selecting Microsoft 365 (M365) as the source or target during migration, users may encounter the error message: “Insufficient privileges to complete the operation” Cause The error appears if the application required for authentication is not properly registered in Microsoft Entra ID (Azure AD) or missing necessary permissions. Resolution To resolve this issue, ensure that applicat..

Date Published 18 Sep 2025

eye_icon

Total Views 242

SKB1102

Troubleshooting the ‘Mailbox does not exist’ Error

Problem Description You are unable to start migration jobs or perform actions that require connecting to your Microsoft 365 (Office 365) tenant using Stellar Migrator for Exchange. The software displays one of the following (or similar) error messages: Mailbox does not exist This error prevents successful authentication and migration operations. Root Cause The Microsoft 365 admin account ..

Date Published 19 Dec 2025

eye_icon

Total Views 275

SKB1103

How to resolve "Mailbox Database Temporarily Unavailable" Error

The mailbox database is temporarily unavailable., Cannot open mailbox…”with details like: .Server = SN6PR06MB4621.namprd06.prod.outlook.com .mdbGuid = ... .mailboxGuid = ... It means that Exchange Online temporarily locked or offloaded the mailbox database associated with that mailbox. This usually happens due to throttling, load balancing, or too many concurrent connections hitting the mail..

Date Published 19 Dec 2025

eye_icon

Total Views 268

SKB1104

Error: 503 Server Unavailable During Exchange Online (EWS) Migration

A 503 – Server Unavailable error from Exchange Online is one of the most common failures during EWS migrations, and it always means: Exchange/Office 365 is temporarily refusing your connection because of throttling, overload, or mailbox database movement. This is NOT a permanent failure. It is a temporary block. Causes: 1. Throttling (Most Common) Microsoft heavily throttles EWS: • ..

Date Published 19 Dec 2025

eye_icon

Total Views 244

SKB1105

Underlying Connection Was Closed Error During EWS Migration

Error Message During migration or mailbox processing, you may see the following error: The request failed. The underlying connection was closed: An unexpected error occurred on a send. Problem Description This error is a network-level failure that commonly occurs during EWS migrations, especially when migrating a large number of items or large mailbox data. The connection between the migratio..

Date Published 19 Dec 2025

eye_icon

Total Views 246

SKB1106

Unable to Connect to the Remote Server Error During EWS Migration

Error Message You may encounter the following error during migration or connection attempts: The request failed. Unable to connect to the remote server. Problem Description This error is a network-level failure that occurs before Exchange Online or EWS processes the request. The connection to the remote Exchange service cannot be established at that moment. This is a temporary issue..

Date Published 19 Dec 2025

eye_icon

Total Views 250

SKB1107

How to Resolve "The SMTP address has no mailbox associated with it" Error?

Cause: The error indicates that the specified folder (usually the primary mailbox) is missing or not accessible. Most often, this happens because the primary mailbox is not available for the affected user account. Resolution: For Exchange Server (On-Premises): kindly check the Primary Mailbox for the user via the Exchange Admin Center (EAC): Steps to check Primary Mailbox in Exc..

Date Published 19 Dec 2025

eye_icon

Total Views 327

Technology You Can Trust

Data Care Experts since 1993