Sometimes Outlook 2007 asks Exchange IMAP mailbox password in middle of use

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This happens randomly, that suddently Outlook asks username and password for IMAP accounts from Exchange 2007 and 2010 servers.

Outlook might popup this notification cople of times in middle of use, and after you choose OK couple of times everything is back to normal.

The account is not locked and running in Exchange server.

Exchange mailboxs don't do this, it's always the IMAP.

Has anyone came across with similar problem?


Ripu Daman


This the issue occurring for all user or some user only since in might be a network related issue, try creating a new profile & check if the same issue occurs or not.

Ripu Daman Mina | MCSE 2003 & MCSA Messaging

Gen Lin


This problem may happens if the client lost connection with the exchange server and then reconnect to the server.

Step 1: Change the server timeouts value
1. Open outlook->Tools->Options->E-mail Setup tab->E-mail Accounts.
2. In E-mail tab, click change, make sure that “Remember password” is selected. Click More settings.
3. In Advanced tab, under “Server timeouts” section, change the value to 3 minutes.

Step 2: Rebuild the password cache
1. Click start button->run, type: control userpasswords2
2. In Advanced tab, click Manage Passwords, remove the item relating to your IMAP account.

Then test to see if the issue persists.




I never figured that this might be network issue, thanks for the answers I'll try them out!



Found solution to this, in evets there was this information:

Event ID 1009 warnings. It says that the " number of simultaneous
connections made by user 'username' exceeded maximum (16)."

In Exchange Management Console I runned command:

Get-ClientAccessServer | set-ImapSettings -MaxConnectionsPerUser 25

Now it works fine!


I just have to ask - why are you using IMAP when you've got Exchange?Lanwench ** Do not fold, spindle or mutilate. Fill in the box completely and erase any stray marks. Use only a #2 pencil.
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