Cannot connect to Exchange Server 2013 using POP3 after Installing windows update on the machine running Exchange and restarted it

Can anybody tell me please the solution for this problem? Before i Installed the windows update running Exchange server 2013 and restarted it, the POP3 is working fine, some clients that are using POP3 to connect to exchange are not having any problems, until i installed the windows update on the machine (windows server 2012) running the exhcange, the problem started, one of the users is having an error message that says: "Sending of password for user user1 did not succeed. Mail server myserver responded: Logon failure: unknown user name or bad password." I though it's the seamonkey email software that is having a problem, but i also performed a test on outlook and still having error.
Thanks for any help.
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MASEE Solution Guide - Technical Dept HeadCommented:
can you post a screenshot of error?
and please post what you see in the eventviewer of Exchange
jonald_vargasAuthor Commented:
Thank you @MAS. Here's the screen shot of the error message. And where should i look for the eventviewer of Exchange? and what specific log do you need? Thank you.
jonald_vargasAuthor Commented:
My issue was resolved, we have two exchange servers. I forgot to check the second server's running services, i noticed that the pop3 services are not set to automatic start, so when i performed the windows update and restarted, it didn't started. I fixed the problem by starting the Microsoft Exchange POP3 and Microsoft Exchange POP3 Backend.

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jonald_vargasAuthor Commented:
It solved my the issue. It is very important to check if all appropriate services are running on all Exchange servers on your environment.
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