Lync 2013 consumes and eats memory and hangs

Hi everyone,

I have been working on a problem where Lync 2013 client will consume almost all RAM resources and causing the whole machine to hang.


You open your machine normally and suddenly Lync 2013 client start to consume all memory and hang the whole machine. This happens even with Lync 2013 client fully patched and with the latest O.S like Windows 8 and Windows 8.1 with all windows updates.

Reason and solution

After deep investigation, and asking people when this started to happen on their machines, they reported a similar story about receiving a Lync meeting on their outlook calender.

So i went to a user affected, and looked for meetings he received that day, i shift delete them from outlook, i then go to C:\Users\username\AppData\Local\Microsoft\Office\15.0\Lync and i deleted the whole content just to flush any cached configuration. Then i started Lync and everything is working fine.

It took me lots of time and a ticket to Microsoft without any luck… Finally i figured it by my own.

 How to verify this fix will work?

To verify that the issue is all about Lync connectivity to Exchange when it tries to pull availability info, just try to make Exchange web services unreachable by that machine, you can do this for example by doing one of the below :

  • Simply play with the machine Hosts file located in c:\windows\system32\drivers\etc , and put imaginary DNS binding for your Exchange web services
  • Disconnect the user mailbox for a moment, try if Lync is starting fine or not.

In both cases, you got to delete the local Lync profile located here C:\Users\username\AppData\Local\Microsoft\Office\15.0\Lync , wait couple of minutes and then open Lync

By Ammar Hasayen Posted in Lync Tagged

2 comments on “Lync 2013 consumes and eats memory and hangs

  1. I tried this and let’s see how it goes. Usually the amount of RAM consumed by Lync 2013, grows from close to 100 to almost 400mb. Anyway, it’s a ridiculous amount of RAM for a simple chat application. They gotta fix it – it consumes twice as much RAM as Outlook and I have more than 20,000 emails indexed, with more than 4GB. Outlooks runs smoothly.

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