9,758 questions
Looking for a simple solution to stop this automatic change from .pdf attached file to a .zip attached file. regards
Files are converted to .zip files after being sent with Outlook
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 94%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJ%3C/text%3E%3C/svg%3E)
Junior
141
Reputation points
Hello everyone!
For 2 weeks now, some files (.docx, .xlsx), sent with Outlook have been converted into a .zip file after they have been sent.
We were able to find this out using the M365 Security Portal.
If the receipient opens the file, it seems to be corrupt and the file size is smaller then the original one.
On the client pc there is no third-party tool or add-in for Outlook installed.
Is this behavior known and possibly caused by an update?
Thanks for your input!
Greetings, Junior
Outlook | Windows | Classic Outlook for Windows | For business
Windows for business | Windows Client for IT Pros | User experience | Other
{count} votes
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(121.6, 11%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECM%3C/text%3E%3C/svg%3E)
ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff2023-03-03T02:26:57.6466667+00:00 Hi @Junior ,
Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back. If you think my reply is helpful to you, please remember to mark it as an answer. Warm thanks.
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 87%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EW4%3C/text%3E%3C/svg%3E)
WimSaarberg-4488 5 Reputation points2024-05-03T03:39:27.05+00:00 How can you stop outlook attached .pdf files being saved as a zip attached file?
Regards Wim
Sign in to comment
2 answers
Sort by: Most helpful
-
-
ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
2023-02-28T05:22:25.9+00:00 Hi @Junior ,
For 2 weeks now, some files (.docx, .xlsx), sent with Outlook have been converted into a .zip file after they have been sent.
Do you mean that after you sent the emails with attachment (.docx, .xlsx), recipients got as .zip format?
If so, have you check if the attachments of emails in your Sent Items folder is the original format or .zip format?
And does this issue occur with all attachments or some specific attachments?
In addition, does this issue occur when you sent emails on Web Mail?
If the issue doesn't occur on Web Mail, in order to further confirm if the issue is related to the current Outlook client, it's suggested that you could try to add your account in other computers and send emails with the same attachments to check if there're any differences.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.