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Lync cannot connect to the Exchange server. Please try signing out and signing back in. Outlook contact and calendar information will be unavailable until the connection is restored

Issue:  Several Problems are there: Clients will unable to save conversation History in Outlook, Calendar Meetings will not sync, status will not reflect on Lync etc.

Error Message: Lync cannot connect to the Exchange server. Please try signing out and signing back in. Outlook contact and calendar information will be unavailable until the connection is restored.

Problem statement: Look like outlook and Lync integration not happened. There are many reasons behind the error message.

Best Practices:  You must open the outlook before Lync.


1.    Many cases, client will use different address [SMTP and SIP] address. E.g. Means email address : and SIP address:

Both addresses should be to get sync with each other.

2.    You change the Lync (SIP) address via Lync control Panel or Lync Server Management Shell.

a.    Command:  

Set-CsUser –Identity “User Name” –SipURI

b.    Open Lync Control Panel > Click on Users > Find User> Double click on it and change the SIP address.

3.    If you don’t want to compare email address and SIP then you disable the Email Comparison via CmdLet.

Set-CsClientPolicy -DisableEmailComparisonCheck $True
    4.    Rare cases MAPI version are not up-to-date.

a.     You copy MAPI32.DLL file from, working computer to affected computer.

b.    Mapi file path:C:\Windows\System32\
c.     You can match the Mapi file using command:

Close the Outlook and Lync from Task manage. Run the following command on command prompt:


After running these commands wait for 2-3 minutes and restart affected computer.

5.    Outlook must use the Defaults Outlook profile.

6.    eMail delivery must be on Server mailbox.

User above and share your feedback. If you like this posts the leave your comments and suggestion.

Thank you.


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