Used for various utilities tasks, including encoding of strings and processing of user information.

Classes

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	Class	Description
	AttachmentEnumerator	Represents an enumerator for SPEmailMessage attachments.
	DateOptions	Provides access to properties and methods that view and set date options.
	IntlDate	Represents an international date value.
	MoblogUtility	Specifies enumerations for a mobile Web log site.
	RightsSensitiveVisibilityHelper	Represents a hyperlink that is hidden if the current user does not have appropriate permissions for the current Web site or list.
	SPDiffUtility	Provides a method and supporting properties to determine the text differences between two strings.
	SPEmailAttachment	Represents an attachment in an e-mail message.
	SPEmailAttachmentCollection	Represents the attachments in an e-mail message.
	SPEmailHeader	Represents a message header for an e-mail message.
	SPEmailHeaderCollection	Represents the collection of message headers for an e-mail message.
	SPEmailMessage	Represents a MIME-formatted e-mail message.
	SPEncode	Provides methods for encoding strings.
	SPHttpUtility	Provides access to methods for encoding and decoding strings when processing Web requests.
	SPIntlCal	Represents an international calendar.
	SPMobileUtility	Provides access to methods and enumerations for working with a mobile Web application.
	SPPrincipalInfo	Provides access to information about the current principal.
	SPPropertyBag	Stores arbitrary key-and-value pairs that contain custom property settings.
	SPStringUtility	Provides access to methods for manipulating strings.
	SPThreadPool	Provides access to methods for queuing a method for execution by using the identity of a remote user or a specified user token.
	SPUrlUtility	Provides access to methods that operate on URLs.
	SPUtility	Provides tools for converting date and time formats, for obtaining information from user names, for modifying access to sites, and for various other tasks in managing a deployment of Windows SharePoint Services 3.0.

Interfaces

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	Interface	Description
	ISPCalendar	Provides methods for working with the local calendar.
	ISqlSession

Structures

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	Structure	Description
	SimpleDate	Represents a date value containing the year, month, and day in any local calendar.

Enumerations

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	Enumeration	Description
	AuthenticationRestrictions	Specifies whether access is restricted to only authenticated users, only anonymous users, or is available to all users.
	DBCSQueryStringEncodings	Specifies whether double-byte character set (DBCS) query strings use Unicode or UTF8 encoding.
	FormatConversionOption	Specifies the format to use for Web Part conversions.
	IconSize	Specifies the default icon size.
	PageModes	Specifies the page mode required to view items.
	PermissionContext	Specifies the context object to which a permission mask is applied.
	PermissionMode	Specifies whether the user must have all of the rights specified in the permission mask to view a link, or only one of the rights specified in the permission mask.
	SPBehaviorInternal	For methods whose behavior has changed between Windows SharePoint Services 2.0 and Windows SharePoint Services 3.0, this class specifies which behavior to use.
	SPDateFormat	Specifies the date and time format.
	SPLangId	Provides access to the integer identifier of the local language.
	SPPrincipalSource	Specifies the source of the current principal.
	SPPrincipalType	Specifies the principal type.
	SPRedirectFlags	Specifies flags for a redirect operation.
	SPSessionCredentialsFlags	Specifies whether the SharePoint session requires authentication.
	SPWebServiceBehavior	Specifies web service behavior.