I received the following message:  (since I have recently been receiving a lot of "funny looking" messages with large, seemingly legit, attachments, I have not opened them.  Is this for real?

Please carefully read the attached instructions before updating settings. 

This file either contains encrypted master password, used to encrypt other files. Key archival has been implemented, in order to decrypt the file please use the following password: PaSdIaoQ 

This e-mail and / or any attachment(s) is intended solely for the above-mentioned recipient(s) and it may contain confidential or privileged information. If you have received it in error, please notify us immediately at helpdesk@zoho.com and delete the e-mail. You must not copy it, distribute it, disclose it or take any action in reliance on it.