Lync Error: "Lync cannot connect to the Exchange server. Please try signing out and signing back in"

Issue

Several Problems are there: Clients is 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

Looks like Outlook and Lync integration not happened. There are many reasons behind the error message.

Best Practices

You must open the Outlook before Lync.

Resolution

Solution:

1.     Many cases, client will use different address [SMTP and SIP] address. E.g. email address : balu.ilag@mydomain.com and SIP address: baluilag@mydomain.com

Both addresses should be in 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 balu.ilag@mydomain.com****

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:

C:\Fixmapi.exe

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.

Please leave comments and suggestions.