Windows 10: Email. How dependant on my ISP is my Webmail account?

I am currently in the process of changing ISP and have been told that if I do, i will only be able to access my email account for 90 day after leaving them. Do I need to have any concerns about this, as I am using the webmail which came with my site domain? I don't use my ISP's Email at all, these days, and haven't done so for about 10 years other than when they ask for my email address which I acquired when I first registered. Thanks in advance.
Windows 10 Version 2004

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Moving ISP Webmail to another ISP

We are changing our ISP to another ISP. If all emails are in Microsoft Outlook 2003 already, will they still be there after the switch. And, how do I copy all contacts from webmail ISP to Microsoft Outlook 2003?

 

Delete mails in Outlook but want to keep mails untouch in webmail

When I deleted an email in outlook and my webmail got deleted too. I want to keep all the inbox mails from the webmail even I complete deleted in outlook. I spend hrs can't think it out how. Any step by step instruction? I'm using IMAP account btw. Thanks and Merry Christmas.

 

Unauthorized Emails from my account?

It is more than likely that your email account was hacked, either by a virus sniffing your password, or just simply hacked.

Either way, change your password on your email account. Unfortunately the damage by already be done. They already have your contact list and your email address associated with that contact list. There is nothing stopping them from sending out emails using their own SMTP servers to everyone on your contact list and claiming the emails are from your email address. They don't actually have to have access to your yahoo account or even any yahoo server to send emails to people that come from your address.