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This is impossible.<br />
You cannot sync one users Exchange account with an entirely different users POP account.<br />
Reason being is that the majority of the info is stored on the exchange server, not the users PC<br />
<br />
You could choose to share, or send a copy of the calendar to the external user.<br />
However, its only a copy<br />
Any changes would need to have the calendar resent.
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This is impossible.
You cannot sync one users Exchange account with an entirely different users POP account.
Reason being is that the majority of the info is stored on the exchange server, not the users PC

You could choose to share, or send a copy of the calendar to the external user.
However, its only a copy
Any changes would need to have the calendar resent.

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We have an Exchange setup in a domain setting. One of the emloyees uses exchange mail account and wants to sync her calendar with another employee at another site who uses pop3 service from the same exhange server. Is there a How To for MS Exchange to accomplish this or do I have to use third-party software?
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We have an Exchange setup in a domain setting. One of the emloyees uses exchange mail account and wants to sync her calendar with another employee at another site who uses pop3 service from the same exhange server. Is there a How To for MS Exchange to accomplish this or do I have to use third-party software?

How to  checklist for Syncing Outlook Exchange calendars

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.