Hello,

Is it possible to copy and paste contacts of about 365 people in the Members field? I noticed that when I hit apply, all the contacts are displayed but then when I hit Saved and Closed, the name displays and then disappears.  I have no problem adding around at least 150 people, but it seemed like adding more than that, I am not able to save it.  My contacts are not on GAL or local address book, it's on my Lotus Notes.  Import and export I believe is not possible in groups....tha

I found this article from Microsoft https://support.microsoft.com/en-us/kb/238569 but didn't mention about the File Size Limit.  does anyone know the file size limit of the DL in Outlook (.pst file)?

Hi,

As descripted in that KB, the distribution list limit is based on the property size limit of the computer that is running Exchange Server. The property size limit for an Exchange server is about 8 kilobytes (KB).

And have you tried the resolution in that KB?

Best Regards.

Hi Lynn,

Thank you for your input. Sorry, I didn't mentioned that we don't have Exchange Server.  What we have is Exchange Online.  We have Office 365 Enterprise E3 subscription.  Is the 8KB still applies then? 

The maximum number of distribution group members is currently in 100,000 members according to the https://technet.microsoft.com/en-us/library/exchange-online-limits.aspx?f=255&MSPPError=-2147217396#DistributionGroupLimits