Exchange 2013 and .NET 4.5 fixes KB2803754 & KB2803755

published an important hotfix for .NET 4.5 earlier this year. It wasn’t picked up on by many, therefor a quick write up on the matter.

Since is built on top of .NET 4.5, it is recommended to install the hotfix on all Mailbox and Multi-Role servers. The hotfix will reduce the memory consumption of the store worker processes.

If you’re using R2, the hotfix is KB2803754 and can be requested here; when using Windows the hotfix is KB2803755 which can be requested here.

After installing the hotfix, you need to do one of the following things:

  • Set the following registry key:
    HKLM\Software\Microsoft\.NETFramework\DisableRetStructPinning=1 (REG_DWORD)
  • Set the COMPLUS_DisableRetStructPinning environment variable to 1

I’d prefer the first option. Note that you need to restart the server for the change to become effective.

Thanks to EighTwOne

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