Hi,
For your first question, it is a known issue, please see this article:
https://support.office.com/en-us/article/Known-issues-with-Office-and-Windows-10-28d56d84-c16c-4763-8eac-e51e05a37a16
And you can try the workaround:
http://answers.microsoft.com/en-us/office/forum/office_2013_release-office_storage/cant-open-or-save-files-after-upgrading-to-windows/9048d1eb-e658-4764-8397-f03e40457452
For your second question, please provide more detailed info:
1) Did you use Outlook client or Gmail web site?
2) Was there any error message?
I suppose this issue might be caused by your first issue, please try to fix the first one and then see if the second one still exists.
Regards,
George Zhao
TechNet Community Support
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