Microsoft Office Word 2007 restricts which characters can be used in an equation as delimiting or grouping characters, as accented characters, or as operators. Currently, there is no method to determine whether a character can be used as one of these characters in an equation.

Additionally, the following Word Object Model class properties are restricted with regard to which characters can be passed through the properties, as follows:

•	OMathDelim class properties: • BegChr • EndChr • SepChr
•	OMathAcc class properties: • Char
•	OMathGroupChar class properties: • Char
•	OMathNary class properties: • Char