Hi,
the following is a possibly complete list of the features you loose when
sharing workbooks and the workarounds if there are any.  You will find pivot
tables as you scroll down
Features that are unavailable in shared workbooks
You can access the following features only if you stop sharing the workbook.
You cannot use shared workbooks (shared workbook: A workbook set up to allow
multiple users on a network to view and make changes at the same time. Each
user who saves the workbook sees the changes made by other users.) on Web
servers.
Unavailable feature	Alternatives
Create lists (list: A series of rows that contains related data or a series
of rows that you designate to function as a datasheet by using the Create
List command.)	None
Work with XML data, including:	None
Import, refresh, and export XML data
Add, rename, or delete XML maps
Map cells to XML elements
Use the XML source task pane, XML toolbar, or XML commands on the Data menu
Insert or delete blocks of cells	You can insert entire rows and columns.
Delete worksheets	None
Merge cells or split merged cells	None
Add or change conditional formats	Existing conditional formats continue to
appear as cell values change, but you can't change these formats or redefine
the conditions.
Add or change data validation	Cells continue to be validated when you type
new values, but you can't change existing data validation settings.
Create or change charts or PivotChart reports	You can view existing charts
and reports.
Insert or change pictures or other objects	You can view existing pictures
and objects.
Insert or change hyperlinks	Existing hyperlinks continue to work.
Use drawing tools	You can view existing drawings and graphics.
Assign, change, or remove passwords (password: A way to restrict access to a
workbook, worksheet, or part of a worksheet. Excel passwords can be up to 255
letters, numbers, spaces, and symbols. You must type uppercase and lowercase
letters correctly when you set and enter passwords.)	Existing passwords
remain in effect.
Protect or unprotect worksheets or the workbook	Existing protection remains
in effect.
Create, change, or view scenarios	None
Group or outline data	You can continue to use existing outlines.
Insert automatic subtotals	You can view existing subtotals.
Create data tables (data table: A range of cells that shows the results of
substituting different values in one or more formulas. There are two types of
data tables: one-input tables and two-input tables.)	You can view existing
data tables.
Create or change PivotTable reports	You can view existing reports.
Write, record, change, view, or assign macros	You can run existing macros
that don't access unavailable features. You can record shared workbook
operations into a macro stored in another nonshared workbook.
Add or change Microsoft Excel 4 dialog sheets	None
Change or delete array formulas (array formula: A formula that performs
multiple calculations on one or more sets of values, and then returns either
a single result or multiple results. Array formulas are enclosed between
braces { } and are entered by pressing CTRL+SHIFT+ENTER.)	Existing array
formulas continue to calculate correctly.
Use a data form to add new data	You can use a data form to find a record.