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Did the first user cancel the series? Even so, seems strange that that happened. 
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Did the first user cancel the series? Even so, seems strange that that happened.

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environment: AD Domain, Exchange 2003, Outlook 2007 on Windows XP sp3. We have 2 users who manage calendars for VP's. Just recently they both had the same issue happen: &nbsp;One cancelled a weekly recurring meeting on behalf of the VP, then got hundreds of cancellation notices, 1 for each date the meeting occurred- all the way back to 2005. <br />
The other user added a new recurring meeting to a different VP's calendar and then watched as dozens of meeting invitations came pouring into her inbox, 1 for each instance of the meeting. We cannot figure out why this is happening only to them and why it suddenly began happening now. &nbsp;Both have managed outlook calendars on behalf of others for well over a year without incident.
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environment: AD Domain, Exchange 2003, Outlook 2007 on Windows XP sp3. We have 2 users who manage calendars for VP's. Just recently they both had the same issue happen:  One cancelled a weekly recurring meeting on behalf of the VP, then got hundreds of cancellation notices, 1 for each date the meeting occurred- all the way back to 2005. 
The other user added a new recurring meeting to a different VP's calendar and then watched as dozens of meeting invitations came pouring into her inbox, 1 for each instance of the meeting. We cannot figure out why this is happening only to them and why it suddenly began happening now.  Both have managed outlook calendars on behalf of others for well over a year without incident.

meeting series invites and cancellations made on behalf of another user sends update for each instance

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

Office Productivity refers both to the act of being productive and efficient in an office or professional environment, as well as the software applications used to "produce" information. This includes the development of professional skills, creating work processes, and almost any program used to create or modify a document, image, audio or video clip. However, business application suites such as Microsoft Office, which include word processing, spreadsheet and presentation programs, are typically called productivity software, as contrasted with a "utility program," such as a file manager, which is used to organize files and folders on the computer. Many office- and business-oriented groups of programs are organized into suites.

Office Productivity

Microsoft applications include a variety of software programs, including development and digital authoring programs (Expression and Media Center), educational programs, Internet software, including Essentials, Skype and the Live family, anti-virus, productivity applications and suites like Office, Excel, Word, Outlook, Access and PowerPoint, video games and server applications such as Exchange, SharePoint, IIS and Virtual Server.