Why does the Microsoft online service need to convert some Office files?

To continue working with certain Office files in this version of Office, Microsoft first needs to convert them to a different format using our online service. To do this, we send certain types of files (shown in the table below) over to a secure Microsoft service over the internet for conversion. The converted file is then sent back to your device immediately. The Microsoft online service doesn't store any of your file content on our servers. You can save the converted file and edit it in Office even when you're offline.

Converting the document to a different format helps you get the most up-to-date features and security functionality across all your devices. More specifically, the files are converted so you can do the following:

The Microsoft online service is used to

Office Mobile for Windows 10

Office for Android

Office for Mac

Office for iOS

Open and edit Excel and PowerPoint binary files (.xls, .ppt) as Microsoft Office Open XML files (.xlsx, .pptx).

Yes

Yes

No

Yes

Open and edit OpenDocument Format files (.odt, .ods, .odp) as Microsoft Office Open XML files (.docx, .xlsx, .pptx).

Yes

Yes

Yes¹

Yes

Open and edit Comma Separated Value (.csv) files in Excel as Microsoft Office Open XML files (.xlsx).

Yes

Yes

No

Yes

Open PowerPoint Office Open XML files (.pptx) that have legacy objects, no longer supported in this version of Office.

Yes

Yes

No

Yes

Open and edit Rich Text Format files (.rtf) in Word as Microsoft Office Open XML files (.docx).

Yes

Yes

No

Yes

Print Excel and PowerPoint files.

Yes

Yes

No

Yes

Export Word, Excel, and PowerPoint files as OpenDocument Format files (.odt, .ods, .odp)

Yes

Yes

Yes¹

Yes

Export Word files as tagged PDF (.pdf)

No

No

Yes

No

Open and edit PDF files as Microsoft Word files (.docx)

No

Yes

Yes

No

1 In Office for Mac, this feature only applies to Word (.docx) files, not Excel or PowerPoint files.

See Also

As mentioned earlier, the Microsoft online service doesn't store any of your file content on our servers. You can read the Privacy Statement for more information. In some very rare scenarios, the converted file might not contain some data that is incompatible with the new version of Office, but the original file is always kept intact and untouched.

Microsoft Privacy Statement

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