Lync 2010 Exchange 2010 Lync client MAPI COM server

Hello All

We are running Exchange 2010 sp1 and Lync 2010 Enterprise edition, Lync is a consoladated install. All outlook clients are running 2010. Users can automatically sign into Lync using DNS and SRV records, but soon after signing in, users get prompted for credentials. The dialog box thats prompting the user says "Microsoft Lync 2010 MAPI COM SERVER" The user tries to enter password and username, (in many different formats) but can never authenticate. What is causing this promt? is it the lync client? Also it looks like the link client cant connect to the Exchange server, users get "lync is experiencing connection issues with the exchange server..."

 

I have verified that Autodiscover is working correctly all outlook 2010 clients are able to find all the Exchange web services using Autodiscover. Also all users have many smtp addressess stamped on there mailbox, one of the smtp addresses is user@mydomain.com. This smpt address is also the users sip address, but this is not the users primary smtp address, its just one of that they have.

 

Any help is greatly appreciated.

 

 

February 28th, 2011 9:09pm

I'm looking for the same solution.  What exactly causes this prompt?  Is it related to Lync not being able to connect to EWS or not?
Free Windows Admin Tool Kit Click here and download it now
March 1st, 2011 8:29am

Yes, I am facing the same situation here, this happened after OCS to Lync Update, this happens when outside of corporate Network or a network status change, say I change from cable to WiFi.

 

This is blowing my mind!

 

March 9th, 2011 8:03pm

The Lync MAPI COM error comes from the Lync client attempting to connect to Exchange Web Services.  So that we can begin to address your issue, can you hold Ctrl + Right click the lync icon in the taskbar and select Configuration information.  Look next to the field EWS Information, what is the Status? 

Mark

Free Windows Admin Tool Kit Click here and download it now
March 10th, 2011 12:20am

Has this been identified as an issue or an installation/configuration problem?  Thanks.

BEN

May 4th, 2011 8:54pm

I discovered that this prompt was coming from Lync trying to connect to the exchange RPC virtual directory.  Solution was to disable basic auth on the virtual directory and use ntlm only.  Ordering ntlm above basic did not work for some reason.  I only had this problem for external users.
Free Windows Admin Tool Kit Click here and download it now
May 5th, 2011 2:47am

Thank you!
May 5th, 2011 9:37pm

Let me know if that actually helps you out.
Free Windows Admin Tool Kit Click here and download it now
May 5th, 2011 10:31pm

will try that. Seem issue here. Using basic auth.
June 29th, 2011 10:59pm

I discovered that this prompt was coming from Lync trying to connect to the exchange RPC virtual directory.  Solution was to disable basic auth on the virtual directory and use ntlm only.  Ordering ntlm above basic did not work for some reason.  I only had this problem for external users.

This happens on office 365, where we don't have control over the type of authentication authorized on the web service.  Any clue as to what to do there?
Free Windows Admin Tool Kit Click here and download it now
July 18th, 2011 3:27pm

Well the normal behavior was to do :

 

Set-OutlookAnywhere -Name Server01 -DefaultAuthenticationMethod <Basic,NTLM>              

 

You enable basis and NTML for IIS. I'm not sure how office 365 is designed but i assume they push basic only.

When you hit CTRL and do a configuration check. Does it say EWS directory okay?

July 20th, 2011 9:54pm

It happens to me with Office 365 too. But Lync continue to work if I press Cancel.

Here is related configuration information:

 MAPI Information: Lync in the process of connecting to the Exchange server. This process may take few minutes...  MAPI unavailable; retrying connection

 

EWS Information -- EWS Status OK

 

Any ideas?

Free Windows Admin Tool Kit Click here and download it now
September 8th, 2011 10:58am

same error "LYNC MAPI COM"

.what the solutions?

 

regards, 

Endrik

December 6th, 2011 6:57pm

 

         Hi,

         I am facing the same situation, but I have founded solution and tested

           By create user in Credential manager on your client

           and define your account in domain

           You can see full information on

  http://beatabit.blogspot.com/2011/03/lync-mapi-2010-com-server.html

       Thank you, Javier Carmona 

Free Windows Admin Tool Kit Click here and download it now
December 20th, 2011 2:05pm

 

         Hi,

         I am facing the same situation, but I have founded solution and tested

           By create user in Credential manager on your client

           and define your account in domain

           You can see full information on

  http://beatabit.blogspot.com/2011/03/lync-mapi-2010-com-server.html

       Thank you, Javier Carmona

December 28th, 2011 11:35pm

First run an https trace (using something like Fiddler2) from a client machine to verify where the dialog box is coming from.  Then naturally go from there.
Free Windows Admin Tool Kit Click here and download it now
January 3rd, 2012 9:08pm

We are seeing this now too.  We recently enabled Outlook Anywhere so I assume that is what sparked it.  I understand with Outlook Anywhere you will see some normal prompts but this is happening to people inside the network and it won't take their credentials.

This is very annoying and we're getting a ton of calls to our support desk.  If anyone else has had this experience and resolved it I'm all ears.  Until then we will start digging...

January 19th, 2012 8:30pm

I'm currently investigating the issue and contacted Microsoft Support for an official answer. When I receive appropriate information, I'll create a nice blog posting on our user-group website (www.pro-lync.be) explaining the process.
Free Windows Admin Tool Kit Click here and download it now
January 20th, 2012 5:10pm

Any update from MS for this issue ? I am so facing the same issue.

February 9th, 2012 1:50pm

I've been busy but finished it today. Here it is:

http://www.pro-exchange.be/blogs/ocs_wave_14/archive/2012/02/10/microsoft-lync-2010-mapi-com-server-authentication-prompt-explained.aspx

Please vote this post as helpful if you think my blog post was helpful to you :)

Free Windows Admin Tool Kit Click here and download it now
February 10th, 2012 3:23pm

Magernisha, did it explain a bit?
February 13th, 2012 11:44am

Pretty much what I had suggested back in May ;)  You did an awesome job actually explaining the entire issue and why it's caused though.
Free Windows Admin Tool Kit Click here and download it now
February 13th, 2012 7:33pm

Outlook 2010 - is this 32-bit?

Windows OS - is 32- or 64- bit deployed?

Is the machine joined to the domain, user sign-in with AD account (Lync enabled) and Outlook configured (auto via Autodiscover)?

February 13th, 2012 8:37pm

Did you figure out what the issue could have been? did you resolve it ? 

I have a similar issue and it is getting progressively worse as the days go on?

Free Windows Admin Tool Kit Click here and download it now
March 8th, 2012 5:14pm

I followed the link by Ruben

http://www.proexchange.be/blogs/lync2010/archive/2012/02/10/microsoft-lync-2010-mapi-com-server-authentication-prompt-explained.aspx

plus i enabled "On fast network, Connect using HTTP first, then connect using TCP/IP" in outlook, and that seem to fix the problem for me.

I'm using Exchange 2010 SP2

  • Proposed as answer by NewFifa Monday, April 16, 2012 10:12 PM
April 17th, 2012 1:12am

go to outlook

File

Account settings

Account settings

double click desired email address

Uncheck "Cache Exchange Mode"

restart computer

Free Windows Admin Tool Kit Click here and download it now
August 22nd, 2012 9:21pm

That did it for us, THANKS!
January 7th, 2014 9:46pm

This topic is archived. No further replies will be accepted.

Other recent topics Other recent topics