• Full name
    Microsoft Outlook Mail Manager Plug-in Collection Format
  • Developer
  • Popularity
Have you encountered a problem with a MMCOLLECTION file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a MMCOLLECTION file here. In the further part of this page we have added a list of programs that should open your MMCOLLECTION file. It is enough you choose a proper application for your operating system, download and install it.

Programs which can open a MMCOLLECTION file

How to open file with MMCOLLECTION extension?

In order to open a file with MMCOLLECTION extension one of the following programs must be installed on user’s system. If a problem with opening MMCOLLECTION file occurred, it is highly possible that none of the listed programs is present on user’s system. Even if one or more said programs are installed, there may be issues related with given programs. In order to solve a problem with MMCOLLECTION files, follow the instructions below.
Install Mail Manager or other program from the list

Most often resolving problems with opening MMCOLLECTION files is very simple. Just install an appropriate program that supports such files. All of the listed programs support MMCOLLECTION files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of MMCOLLECTION files or offer file conversion options, but may not be capable of editing such files.

Set Mail Manager as the default program for opening MMCOLLECTION files

It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate MMCOLLECTION files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Mail Manager applications is not on the list, select "Browse" option in order to manually locate the directory where Mail Manager has been installed.


Check the section that lists most common problems with MMCOLLECTION files

Sometimes problems with opening MMCOLLECTION files may not lie with the application itself, but can arise due to other causes, such as:

  • File data is corrupted
  • MMCOLLECTION files has been not been completely download from the internet (only a part of the data has been downloaded)
  • Currently used user account hasn’t been granted necessary privileges to open MMCOLLECTION files (should that be the case, please contact your system administrator or IT specialist)
  • MMCOLLECTION file was being copied from a corrupted storage device and is incomplete or data is corrupted. (Copying files from unknown or untrusted sources should be conducted with great care as such files may contain malicious software, which can damage your system)

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