WIN8 Mail App malfunctioning

Have used WIN8 Mail without problems since end 2013 on 2 laptops
On 25 Nov 2016 following problem started:
(happened after re-login to hotel wifi with new password)
When opening Mail and connecting to internet, ALL mails on BOTH laptops disappeared.
Since then, synchronising will start for approx 5-10 secs, after which message: emailaddress@outlook.com is unavailable
ditto for Calender
People actually says: connected to Windows account
Mail / People / Calender will no longer load offline either.
(Note: gmail still comes through ok)
Used eMclient as a backup in the past – on synching same happened there

Once Mail pulled up a few emails (odd ones spread over the past 3 yrs)
Folder structure still mirrors server settings (even after changing it on the server)

Have tried:
Deleted and re-added accounts: outlook(default) and gmail
Updated and Troubleshoot App
Uninstalled and reinstalled Mail App
System restore: after restore all emails were shown again; after connecting it all diappeared again in a matter of seconds.
SFC scan – no problems found

Direct login to outlook.com is working fine – all info is there.
Also Installed Ezi-Mail app from the store – that functions and synchs without problem!

Still prefer Mail to function as it should - any suggestions?