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TsooRad is a blog for John Weber. John was a Skype for Business MVP (2015-2018) - before that, a Lync Server MVP (2010-2014). My day job is titled "Technical Lead, MS UC" - I work with an awesome group of people at CDW, LLC. I focus on collaboration and infrastructure. This means Exchange of all flavors, Skype, LCS/OCS/Lync, Windows, business process, and learning new stuff. I have a variety of interests - some of which may rear their ugly head in this forum. I have a variety of certifications dating back to Novell CNE and working up through the Microsoft MCP stack to MCITP multiple times. FWIW, I am on my third career - ex-USMC, retired US Army. I have a fancy MBA. One of these days, I intend to start teaching. The opinions expressed on this blog are mine and mine alone.


IMAP fails Exchange 2010

The Situation/Problem

E2007 migration to E2010.  Client needs IMAP to work for some high-powered clientele – this thing really needs to be SSL also.  E2007 is working as required, so E2010 should slam dunk this requirement, right?  Wrong!

Using a CASArray, so I configured a Thunderbird to go right at a CAS; nope….no good.

Changed the CAS to plaintextlogin (set-imapsettings –logintype plaintextlogin) – still no go.  Restarted services and spattered the sacred IT Chicken Blood on the nearest wall.  We were also seeing weird results in password types – Thunderbird will “probe” the target server for you – which resulted in Kerberos/GSSAPI as the auth choice – no, that is wrong, we want SSL and regular text password.  Double checked the e2007 server and determined that the e2010 IMAP was configured identically to the E2007.

Double checked that I had changed the IMAP SSL certificate on both CAS array members correctly… (Set-ImapSettings -server Server01 -X509CertificateName CertificateName01) - You do know about the x509 and IMAP SSL thing, right?

I just wasted 3 hours of my life over this….

The Fix

Then this was found on the forums…You must be kidding me! So here is what fixed my issue:

Open the file at

C:\program files\Microsoft\Exchange Server\V14\ClientAccess\PopImap\Microsoft.Exchange.Imap4.exe.config

I went to bottom of the <dependentAssembly> as shown here:


And inserted what was indicated.  Note that I have four lines of additions there, so what you see below is wrapped.  However, I have also cleverly given you an example to follow.  How thoughtful of me, eh?

<assemblyIdentity name="Microsoft.Exchange.Compliance" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<codeBase version="" href="
file:///C:\Program Files\Microsoft\Exchange Server\V14\bin\Microsoft.Exchange.Compliance.dll" />

After restarting the IMAP service on the CAS, everything worked ok.  Changed IMAP back to “SecureLogin” – still good.

Now, I did not try the POP fix as that was not needed for my client environment…


1 comment:

Rachel Burr said...

Thanks for this i have bookmark the guide just incase i ever have to do this again next time my server crashes cheap wildcard ssl

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