Why does removing attachments from .msg e-mails saved on the network increase the file size?

Some staff here like to save all their e-mails with attachments to the file server as individual .msg files, which has been causing a significant increase in used space. In testing the idea to save an e-mail but remove all attachments, I noticed that this caused the .msg file to INCREASE in size on the server instead of decreasing. I tried it multiple times with different e-mails and got the same result. Is this normal behavior? Is there a way to get the expected result of a decrease in file size when removing attachments?
ruhkusAsked:
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Sudeep SharmaTechnical DesignerCommented:
Do you see the increase in the Exchange DB as well?
Do you see the increase in the mailbox of the user?

Have you tried compressing the mailbox of the user, using "Compact Now"?

have you noticed the change in the server side usage vs. local items?

Sudeep
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ruhkusAuthor Commented:
The staff are dragging the e-mails from Outlook to the file server and it is creating an .msg file that has the e-mail and it's attachments. Unless I'm mistaken, once copied to the file server, this should not have any impact on Exchange, so I don't believe those questions apply?
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Sudeep SharmaTechnical DesignerCommented:
In testing the idea to save an e-mail but remove all attachments,

Confused with your question quoted above.

Sudeep
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ruhkusAuthor Commented:
Staff are dragging and dropping e-mails from Outlook to a file server. This creates a copy of the e-mail as an .msg file (no longer tied to Exchange) on the file server along with attachments.
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Jeff DarlingDeveloper AnalystCommented:
How are the attachments being deleted in the msg file?
Is the msg file being saved after deleting of the attachment?
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ruhkusAuthor Commented:
E-mail is drag and dropped to save a copy on the hard drive. I open the .msg file, right-click on the attachment(s), select remove attachment, confirm, then when closing the file click yes to save. The file is saved without the attachments but does not decrease in size.

I tested by saving to my local hard drive and same issue.
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Jeff DarlingDeveloper AnalystCommented:
can you try saving as a different msg name?  

The msg file is like a file system.  The msg only deletes the directory entry within the msg file, but if you do a SaveAs, then it will rebuild the directory entries in the msg file.

original
2017-04-03  09:04 AM           820,736 test01.msg

File after delete of attachments and SaveAs
2017-04-03  10:48 AM            21,504 testout.msg

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ruhkusAuthor Commented:
Saving with a different name appears to work. Thanks. It makes the process a bit longer than I had hoped (when dealing with a hundred e-mails daily), but it does seem like the only option at this time.
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