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https://docs.microsoft.com/en-us/microsoft-365/admin/misc/password-policy-recommendations

Password guidance for your users. Here's some password guidance for users in your organization. Make sure to let your users know about these recommendations and enforce the recommended password policies at the organizational level. Don't use a password that is the same or similar to one you use on any other websites.

https://www.microsoft.com/.../wp-content/uploads/2016/06/Microsoft_Password_Guidance-1.pdf

Microsoft Password Guidance Robyn Hicock, rhicock@microsoft.com Microsoft Identity Protection Team Purpose This paper provides Microsoft’s recommendations for password management based on current research and lessons from our own experience as one of …

https://www.microsoft.com/en-us/research/publication/password-guidance

Microsoft sees over 10 million username/password pair attacks every day. This gives us a unique vantage point to understand the role of passwords in account takeover. The guidance in this paper is scoped to users of Microsoft’s identity platforms (Azure Active Directory, Active Directory, and Microsoft account) though it generalizes to other ...

https://support.microsoft.com/en-gb/help/4026406

A good password: Is at least eight characters long. Doesn't contain your user name, real name, or company name. Doesn't contain a complete word. Is significantly different from previous passwords. Contains uppercase letters, lowercase letters, numbers, and symbols.

https://support.microsoft.com/en-us/office/protect-a-document-with-a-password-05084cc3...

Word Online can’t encrypt a document with a password, and it can’t open documents encrypted with a password. If you want to protect the file with a password, click or tap Open in Word to open your document in the desktop version of Word. After you've added password protection, you’ll need to use the Word desktop program to open the document.